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Reverse Indirect

I remember thinking once that a reverse indirect would make a good buffer tank in the right situation. That was a long time ago, but I think I find myself in the right situation. What brands of reverse indirects are out there these days? Does anyone use these?

Reverse indirect is in effect external DHW heat exchanger. it has high peak capacity and lower storage capacity then conventional tank. to size it as a buffer tank will be at least double price compare to indirect water heater. On commercial jobs i use inverted indirect as inter-cooler to bring boiler return temp down.

I understand what you mean by external. HX. What I'm picturing is like the Thermomax. I need a buffer tank and an indirect but the capacity on the indirect is not very high. Just for hand washing and cleaning crew usage. No showers. I'd love to put the buffer tank and Domestic hot water on a single footprint,

My suggestion on the stainless was to stay away from tanks that have steel or other materials that are not suitable for potable water. The triangle tube smart for example would be a bad choice due to the steel in the outer tank.

is looking more and more like it may be the optimal upgrade for a conventional boiler. ODR-controlled mixing valve on the system side, boiler @140F minimum anyway, ought to play nice with a tempering valve on the DHW outlet.

Heat-Flo coil appears to be at the bottom of the tank (looks like another Dejong?)

Does anyone make an indirect with the coil at the top of the tank?

Ergomax and Turbomax coils are full height, which may be the only viable option. Anyone used both and have an opinion? I believe Ergomax beefed up their insulation awhile back.